Nana Kwao Freiku
Kumasi (Remote)
Summary
Dedicated professional with extensive experience in the field, consistently delivering high-quality results. Proven track record of exceeding expectations in challenging assignments. Strong work ethic and reliability in project completion.
Overview
3
3
years of professional experience
Work History
Full-Stack Developer
Miles Innovation and Technology
Kumasi
01.2023 - Current
- Engineered production REST API using NestJS with over 25 endpoints for SMS contacts, templates, credits, payments, and administration tasks.
- Implemented atomic credit deduction using PostgreSQL row-level locking within Prisma transactions to prevent over-dispatch under concurrent loads.
- Created append-only immutable ledger for reliable tracking of all credit movements.
- Devised multi-provider SMS dispatch solution utilizing Arkesel as primary service and Termii as fallback through BullMQ async queue with adjustable concurrency settings.
- Tracked message delivery via provider webhooks secured by HMAC-SHA256 signature verification for data integrity.
- Facilitated integration of Hubtel mobile money payment gateway featuring idempotent callbacks identified by unique client reference UUID for automated credit top-ups post-confirmation.
- Established comprehensive security protocols including bcrypt-hashed API keys, JWT token rotation practices, rate limiting at 60 requests per minute, IP blocklisting middleware, XSS-safe input sanitization techniques, and detailed audit logs.
Education
Diploma - Information Technology
Kumasi Technical University
Kumasi, Ghana08-2024
Bachelor of Science - Computer Science
Kumasi Technical University
Kumasi, Ghana04-2026
Skills
- Nextjs and React
- TypeScript and JavaScript
- NestJS and RESTful API design
- JWT authentication and RBAC
- Prisma ORM and Redis
- Tailwind CSS and Zustand
- BullMQ and background jobs
- Exponential backoff and AWS S3
- Docker, Docker Compose, and PM2 cluster mode
- Watchtower and HashiCorp Vault
- HMAC verification and bcrypt
- Rate limiting, CSRF, and input sanitization
- Audit logging and Turbo
- Web security measures
- Vercel, Hubtel, and Paystack integration
- Testing frameworks
Projects
- MIGT SMS Platform, Full-Stack Developer, NestJS, TypeScript, PostgreSQL, Redis, BullMQ, Prisma, Next.js , React , Docker, Designed and built a production REST API serving endpoints across SMS, contacts, templates, credits, payments, and admin domains.
- GSMS - Multi-Tenant School Management System, Full-Stack Developer, NestJS, TypeScript, PostgreSQL, Redis, Prisma, Next.js, Turbo Monorepo, AWS S3, Paystack, Hashicorp Vault, Docker, PM2, Architected a NestJS backend with feature modules covering student records, teacher assignments, attendance, grading, fees, payroll, inventory, and multi-channel notifications.
- MIGT Home - Company Marketing Website, Frontend Developer, Next.js, TypeScript, Tailwind CSS, Resend, React Email, Vercel. Built a fully static, zero-database company website with a content-first architecture.
Programming Languages
- TypeScript
- JavaScript
Engineering Patterns - Applied Across Projects
- Async Processing - BullMQ queues backed by Redis for SMS dispatch and background jobs
- Security - Bcrypt hashing, JWT + refresh token rotation, HMAC webhook verification, rate limiting, CSRF protection, audit logging
- Multi-Tenancy - Tenant-scoped data access enforced at guard and query level
- Modular Architecture - NestJS feature modules with clear separation: controllers, services, DTOs, validators
- Database Design - Prisma ORM with strategic indexes, composite constraints, and immutable ledger tables
- Error Handling - Discriminated error unions, global exception filters, structured logging with correlation IDs
- Testing - Jest unit, integration, E2E, and security test suites
Languages
English
Upper Intermediate (B2)
B2
Timeline
Full-Stack Developer
Miles Innovation and Technology
01.2023 - Current
Diploma - Information Technology
Kumasi Technical University
Bachelor of Science - Computer Science
Kumasi Technical University